Last week I finally gave in and put more screenwash in my car. It must have been empty as loads went in. Since then however the pressure of the water has been minimal, just hitting the bottom of windscreen, and then yesterday it now just trickles out of the jets. It makes a noise but my windscreen is filthy so quickly in this weather. How can I fix this without taking to a garage. I have read a few other posts but they don't make much sense to me. Please can u help me but put it as though it's an idiots guide!!! Thanks in advance!!